930 Tur MIcROscoPE. 
the standard at London and Paris. Dr. Ewell had examined this 
scale every day for thirty days by a comparitor with microscope 
attachment, and while variations of temperature cause differences 
in length, owing to the expansion and contractions of metals, yet a 
mean of his measurements are almost identically the same as Pro- 
fessor Roger’s. 
Dr. Fell said that we might well be proud of such work as it 
is not surpassed in the world, and we now have standards for mi- 
nute measurements which are perfect. 
Professor Rogers then followed with a paper “On methods of 
dealing with the question of temperature in the comparison of 
standards of length,” and exhibited a new form of metal ther- 
mometer of his own construction, which is extremely sensitive. 
Erle H. Sargent read a paper “On the use of Nitrite of Amyl 
for fine injections.” The inhalation of Amy] dilates the capillaries 
and blood vessels, thus permitting their more perfect injection. 
* Notes on Argulus Cotostomi, a fish parasite,” and “On some 
new or rare Infusoria,” by Professor D. 8. Kellicott, were read by 
abstract. 
Meeting adjourned. 
Friday, though the last day, was a busy one. 
The morning opened with a fair attendance. Ten new mem- 
bers admitted. 
During the working session yesterday, Mr. Griffith with his 
usual generosity, distributed a mass of diatomaceous material from 
his private box, in which were some valuable slides and books 
which were erroneously distributed. It was, on motion, resolved 
to call attention to this fact and to ask their return as. they were 
undoubtedly taken under misapprehension. 
The committee to audit Treasurer’s account, reported through 
Dr. Newcomer, as follows: 
Cash on hand, August, 1885, . ; ; A ; x $407.65 
Received during the year, . ; : ; : , 401.26 
$808.91 
Expenditures, . E : : : : : ; : 693.06 
Leaving cash balance, . : ; 5 : d : $115.85 
On motion, report received. 
Committee on Rules, by Gen. J. D. Cox, reported progress, and 
